1. Home
  2. Directory
  3. District Of Columbia
  4. Washington
  5. Pediatrics
  6. NPI Profile
Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

DR. GUILLERMO ALFRED BALFOUR MD
NPI 1366412520
Pediatrics in Washington, DC

Active since January 23, 2006
3301 NEW MEXICO AVE NW, STE 238, WASHINGTON, DC 20016(202) 537-1180(202) 244-7410 Get Directions Write a Review

NPPES record last updated: July 13, 2026. Verified against the NPPES registry weekly; last sync: August 09, 2026.

About Dr. Guillermo Alfred Balfour Md NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. GUILLERMO ALFRED BALFOUR MD (NPI 1366412520) is an individual pediatrics provider in Washington, District Of Columbia, licensed in District Of Columbia (MD3823) and active in the NPI registry since January 2006.

NPPES Registry Identity

NPI1366412520
Entity TypeIndividualMale
Primary Taxonomy208000000X
Provider Legal NameDR. GUILLERMO ALFRED BALFOURCredential: MD
Location Address3301 NEW MEXICO AVE NW, STE 238Washington, DC 20016
Mailing Address3301 New Mexico Ave Nw, Ste 238Washington, DC 20016 · (202) 537-1180 · Fax (202) 244-7410
Phone(202) 537-1180
Fax(202) 244-7410
Sole ProprietorNo
Enumeration DateJanuary 23, 2006
Last NPPES UpdateJuly 13, 2026
✔ NPI 1366412520 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPediatricsAllopathic & Osteopathic Physicians
Taxonomy Code208000000X
License✔ Licensed in DC · MD3823
Definition
A pediatrician is concerned with the physical, emotional and social health of children from birth to young adulthood. Care encompasses a broad spectrum of health services ranging from preventive healthcare to the diagnosis and treatment of acute and chronic diseases. A pediatrician deals with biological, social and environmental influences on the developing child, and with the impact of disease and dysfunction on development.
3301 NEW MEXICO AVE NW, Washington, DC 20016
Open in Google Maps ↗

Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

STANELY R. ROTHSCHILD, M.D., P.C.
Durable Medical Equipment & Medical Supplies
3301 NEW MEXICO AVE NW, SUITE 248
WASHINGTON, DC 20016
District of Columbia (202) 244-0707
KRISTA LYN MCFARREN M.D.
Radiology (Diagnostic Radiology)
3301 NEW MEXICO AVE NW, SUITE 102
WASHINGTON, DC 20016
District of Columbia (202) 966-0606
DR. SAID MOKHTARZADEH D.D.S.
Dentist (General Practice)
3301 NEW MEXICO AVE NW, STE 326
WASHINGTON, DC 20016
District of Columbia (202) 966-0979
DR. CATHARINE LISA KAUFFMAN M.D.
Dermatology
3301 NEW MEXICO AVE NW, SUITE #210
WASHINGTON, DC 20016
District of Columbia (202) 363-9600
PHYSIOTHERAPY ASSOCIATES INC
Clinic/Center (Physical Therapy)
3301 NEW MEXICO AVE NW, SUITE 318
WASHINGTON, DC 20016
District of Columbia (202) 363-0454
METROPOLITAN EYE ASSOCIATES, PLLC
Optometrist (Corneal and Contact Management)
3301 NEW MEXICO AVE NW, SUITE 216
WASHINGTON, DC 20016
District of Columbia (202) 237-2451
LAURA JEANNE ROBERTSON M.D.
Radiology (Diagnostic Radiology)
3301 NEW MEXICO AVE NW, SUITE 106
WASHINGTON, DC 20016
District of Columbia (202) 966-0606
DR. JOSHUA MICHAEL AMMERMAN M.D.
Neurological Surgery
3301 NEW MEXICO AVE NW, SUITE 352
WASHINGTON, DC 20016
District of Columbia (202) 966-6300

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Guillermo Balfour's NPI number?

The NPI number for Guillermo Balfour is 1366412520. It was assigned to this individual provider in the NPPES registry on January 23, 2006.

Where is Guillermo Balfour located?

Guillermo Balfour practices at 3301 New Mexico Ave NW Ste 238, Washington, DC 20016. The listed phone number is (202) 537-1180.

What is Guillermo Balfour's specialty?

The primary specialty registered for this NPI is Pediatrics with taxonomy code 208000000X.

When was this NPI record last updated?

The NPPES record for Guillermo Balfour was last updated on July 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 28 days ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.